Question

What is $T_{\mu\nu}T_{\mu\nu}$ for the electromagnetic stress-energy tensor?

Answer 1

there a notation reason for this or do these objects just not .... The Einstein summation convention does not allow for this.. ⚠⚠

Answer 2

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❇${\mathbb{CORRECT...ANSWER}}$

✔The stress–energy tensor, sometimes stress–energy–momentum tensor or energy–momentum tensor, is a tensorquantity in physics that describes the densityand flux of energy and momentum in spacetime, generalizing the stress tensor of Newtonian physics. It is an attribute of matter, radiation, and non-gravitational force fields. 

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